Automatic cut-out mechanism for electrically-operated bulkhead-doors.



No. 810,915.- PATENTED JAN., 30, 1906.

W. B. COWLES. AUTOMATIC CUT-OUT MECHANISM FOR ELEOTRIG'ALLY OPERATED BULKHEAD DOORS.

APPLICATION FILED JULY 11. 1904.

3 SHEETS-SHEET 1.

INVENTOR MW I I, /.v.

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ATTURNEYs WII/VESSES: (2.. (k1. (zwdlt No; 810,915. PATENTED JAN. 30, 1906' w. B. :COWLES.

AUTOMATIC GUT-OUT MECHANISM FOR ELEGTRIG'ALLYY'TOEERATBD BULKHEAD DOORS.

APPLICATION rum) JULY 11. 1904. 3 sunken INVENTOH ATTORNEY 5 No. 810,915. PATENTED JAN. 30, 1906. W. B. GOWLES. AUTOMATIC OUT-OUT MECHANISM FOR ELBGTRIGALLY OPERATED BULKHEAD DOORS.

APPLICATION FILED JULY 11 3 SHEETS-SHEET 3.

WIT/VE88E8:

MTORNEVS To all whom. it may concern:

UNITED STATES PATENT OFFICE.

WILLIAM BARNUM OOWLES, OF CLEVELAND, OHIO, ASSIGNOR TO THE LONG ARM SYSTEM OOMPANY, OF CLEVELAND, OHIO, .A CORPO- RATION OF OHIO.

AUTOMATIC CUT-OUT MECHANISM FOR ELECTRlCALLY-OPERATED BULKHEAD-DOORS.

Patented J an. 30, 1906.

Application filed July 11, 1904. Serial No. 216,143.

' Be it knownthatI, [WILLIAM BARNUM CowLas, a citizen of the United States, residat Cleveland, in 'the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Automatic Cut- Out Mechanism for Electrically Operated Bulkhead-Doors, &c.; and I do hereby declare the following to be a full, clear, and exact descri tion of the invention, such as will enablel ot ersi skilled in the art towhich it ap ertainstomake and. use the same.

yinvention relates to automatic cut-out mechanism primarily intended foruse in the :1

electrical ,JOIJGD-atlOfl of water tight doors,

- hatches, or .thelikeybut it is also capable of use whenever it is desiredto cutoff the electrio current from driving mechanism when theload exceeds a predetermined limit.

ence to the accompanying drawings, in which My invention is especially intended for automatically cutting off the current from sliding bulkhead-doors when'any obstruction to the motion of the door is encountered which; would impose an excessive loadon the motor and either burn out the fuse or the motor.

My invention also relates to certain improvedmechanism whereby'the door may be moved either by electricity or by handpower and whereby the door may be operpited either from a distance or locally at the cor.

invention will be understoodby referthe same parts are indicated'by the same letters throughout the several views.

Figure 1 is a front View showing the doorframe: and a horizontally-sliding vertical bulkhead-door in the closed position, togetherwith the arts for operating the same. Fig. 2 is a similar view to Fig. 1, except that the part of the casing at the top of the door is roken away; Fig. 3 shows a section along the line 3 3 of Figs. 1 and 2, parts being shown in elevation. Fig. 4 shows a section alo the broken line 4 4 of Fig. '5 and looking own said figure. Fig. 5 shows a section along the line 5 5 of Fig. 4, artsbeingshown in elevation. Fig. 6 is a etail showing the pivoted arm for operating they'oke connected to the rod for turning the limit-switch, the view being taken on the reverse side from that shown in Fig. 5. Fig. 7 shows a'section along the broken line 7 7 of Fig. .5, parts being shown in elevation. Fig. 8 shows the cam engagement for operating the arm controlling the limit-switch, and Fig. 9 is a detail showing the action of the armfor operating the limit-switch.

A represents the bulkhead, having guide-- rails A for the door to run out on, and the bulkhead carries a heavy frame A, in which the door is jammed when. closed, so as to be substantially water-tight, in the manner well known in the art. The manner of tightening the door is not part of my present invention and will not be further described herein.

counter-shaft E, which counter-shaft carries a pinion E, which meshes with the inion F on the shaft F. This pinion F is I the-pinion G on the armature-shaft G of the electric motor, which is contained in the cas-' ing G. The shaft E carries the hand-wheel E? on one side of the door, by means of which the worm D may be turned by hand, and the shaft F carries a hand-wheel F at the other side of the door, which may also be used to turn the worm-wheel D. Thus it will be seen that the door may be opened by hand from either side of the door. It will be obvious that both hand-wheels may be placed on the shaft E, one ateither side of the bulkhead, if desired; but the interposition of the idler F affords a more convenient arrangement for the operative mechanism at the top of the door with regard to the structure of the ship.

In order to keep out dust, &c., the operative parts at the head of the door are mounted in suitable casings D", G", and K", which are secured to fixed artsf'of the structure.

In the box it "a'- suitable controller is mounted, which is operated by hand by means of the hand-lever K. In addition to this controller contained in this box there is a solenoid L, mounted in the casing U for turnfiled July 11, 1904. In this same box K, is

'ven by also mounted the limit-switch H, which has two contact-points h and h, adapted to com-' plete the circuit through the motor when it is otherwise closed. This limit-switch is rocked by means of the rod H, which passes throu h the casing PP and carries at its end the yo e H provided with lugs k and 7f. These lugs are struck by the lug m on the head M of the arm M, which head is provided with inclined faces m and 711?, (see Fig. 6,) which permit the shaft H to be rocked when the lug m strikes either of the In s h and 79, but which normally holds the yo e H against rocking when in the initial or zero position. (Shown in Figs. 5 and 6.) This armM normally remains in this zero position and is only rocked about its pivot M when the load-on the motor exceeds a predetermined limit, and the manner in which this is accomplished will now be described. The arm M being pivoted in the; casing, as at M is provided with a socket M in which the yoke M is pivoted. This yoke projects into an annular groove n in the sleeve N, which is splined, as at a, (see Figs. 5 and 7,) on the sleeve P, fast to the shaft 0. This sleeve N is provided with camgrooves 173, oppositely disposed, as shown in Fig. 8, into which camrooves project the lugs g from the interior of the sleeve Q. This sleeve Q is fast to or integral with the w ormwheel D, and this worm-wheel is normally held against turning on the shaft C by the,

spring U as will be hereinafter described, and it is also held against longitudinal movement on said shaft, as by means of the shoulders p and the ring p" projecting into the groove p (see Fig. 5,) or it may be held against ongitudinal motion on the shaft in any other convenient way. I have shown the sleeve Q as made separate from but attached to the worm-wheel D, this for convenience of manufacture; but the two may be inte ral with each other, if desired.

T e wormwheel D has mounted thereon, preferably near the periphery thereof, the roller R, which roller projects between the downwardly-projecting lugs t of the arms T and T, which arms are pivoted, as at t and 2?, to the bracket P, fast to or integral with the sleeve P. The stop P projects down from this bracket between the free ends i and t of the pivoted arms T and T, while the opposite ends of said arms are pivotally connected to the telescopic members .U and U carrying the spring U These members are connected together by the screw U, as shown in Fig. 4. The spring U is held under compression between the shoulders to and u, and this spring therefore causes the opposite ends t and t of the arms T and T' to ress hard against the stop P and thisstop imits the swing of the arms T andTCtoward the stop. The compression of the spring U," is so adjusted that when the loadon the mo 65 tor exceeds a predetermined limit the roller R will press against one or the other of the free ends t and t of the arms T and T with sufficient force to rock that arm against the action of said spring, as shown in Fig. 9. This will cause the shaft C to lag with regard to the worm-wheel D and will cause the lugs g to cam the sleeve N up or down, rocking the arm- M about its pivot, and consequently rocking the shaft H and cutting off the current from the motor.

It will be seen that if the door is in the act of closing and encounters an obstaclesuch as a bag of coal, or a piece of timber, or any other similar obstructionthe shaft C will be caused to lag slightly behind the wormwheel D against the action of the spring U and the current will be cutoff. In a similar way, if the obstruction is encountered upon opening the dooras, for instance, when the door strikes the buffer A", (see Fig. 1)the worm-wheel D will be caused to lag behind the shaft C through a small angle in the opposite direction and will cut off the current e ually well. The current will remain out 0 unless the obstacle is removed or unless the door is started in the opposite direction, which will restore the parts to the initial p0 tion. (Shown in. Figs. 5 and 6.) Thus it will be seen that when the strain on the motor exceeds a predetermined limit, no matter whether the door is opening or closing, the current will be cut off, thus preventing the burning out of the motor or injury'to the mechanical parts through excessive load. This action will take place entirely independent of whether it is turned on from a distance, and thus each door is provided with auto matic protection against injury from excessive strains.

It will be obvious that various modifications might be made in the herein-described apparatus which could be used without departing from the spirit of my invention.

Having thus described my invention, what I claim, and desire to secure by Letters Patent of the United States, is

1. In a system of the character described, the combination with a door or hatch, of an electric -motor, and gearing driven by said motor for operating the door or hatch, pivoted arms with a stop therefor, a spring under compression mounted between said arms, a lug or roller connected to a member of said gearing, and forcing one or the other of said arms against said spring when the load on said gearing exceeds a predetermined limit, and means controlled bythe yielding of said arm against said spring for cutting off the current from said motor, substantially as described. I

2. In a system of the character described, the combination with a 'door or hatch, of an electric motor, and gearing driven by said motor for operating the door or hatch, pivoted arms with a stop therefor, a spring unthe combination with a door or hatch, a rack or racks secured thereto, and a shaft with a pinion or pinions meshing inSaid rack or racks, of an electric motor, and gearing driven by said motor for turning said shaft, arms pivotally mounted on saidshaft and a stop for said arms, a spring under compression mounted between said arms, a-lug or roller connected to a member of said gearing .and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, and a cut-out switch controlled by the yielding of said arm against said spring, for cutting ofi the current from said motor, substantially as described.

4. In a system of the character described, the combination with a door or hatch, a rack or racks secured thereto, and a shaft with a pinion or pinions meshing in said rack or racks, of an electric motor, and gearin driven by said motor for turning said sha t, arms pivotally mounted on said shaft and a stop for said arms, a spring under compression mounted between said arms, a lug or roller connected to a member of said gearing and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit,

-and means controlled by the yieldin of said arm a ainst said spring,for cutting o thecurrent om said motor, substantially as described. i

5. In a system of the character described, the combination with a door or hatch, of an electric motor, and gearing driven bysaid motor for operating the door or hatch, pivoted arms with a stop therefor, a spring under compression mounted between said arms, means for adjusting the compression of said spring, a lug or roller connectedto a member of said gearing, and forcing one or'fthe other of said armsagainst said spring when the load i on said gearing exceeds a predetermined limit, and means controlled bythe yielding of said arm against said spring for cutting off the current from said motor, substantially as described. a

6. In a system of the character described, the combination with a door or hatch, of an electric motor, and gearing driven'by said motor for operating the door or hatch, pivoted arms with a stop therefor, a spring under compression mounted between said arms,

means for adjusting the compression of said spring, a lug or roller connected to a member of said gearing, and forcing one or the other of said arms against said spring when the load on said gearing exceeds a predetermined limit, and a cut-out switch controlled bythe yielding of said arm against said spring for cutting off the current from said motor, substantially as described.

7. In a system of the character described, the combination with a door or hatch, a rack or racks secured thereto, and a shaft with a pinion or pinions meshing in said rack or racks, ,of an electric motor, and gearing driven by said motor for turning said shaft, arms pivotally mounted on said shaft and a stop for said arms, aspring under compression mounted between" said arms, means for adjusting the compression of said spring, a lug or roller connected to'a member of said gearing and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, and a cut-out switch controlled by the yielding of said arm against said spring, for cutting ofi the current from said motor, substantially as described.

8. In a system of the character described, the combination with a door or hatch, a rack or racks secured'thereto, and a shaft with a pinion or pinions meshing in said rack or racks, of an electric motor, and gearing driven ivotally mounted on said shaft and a stop or said arms, a spring under compression mounted between said arms, means for adjusting the compression of said spring, a lug or roller connected to a member ofsaid gear- 7 ing and forcing one or the other of said arms against the actlon of said spring when-the load on said gearing exceeds a predetermined limit, and means controlled by the yielding as described.

i 9. In a system of the character described, the combination with a door, of an electric motor, and gearing driven by said motor for o crating the door, pivoted arms with a stop t erefor, a coil-spring under compression mounted between said arms, a telescopic spring, a lug or r0 ing, and forcing one or the other of said arms against said spring when the load on said gearing exceeds a predetermined limit, and a cut-out switch controlled by the yielding of said arm against said spring for cutting off the current from said motor, substant'al y as described.

10. In a system of the character described, the combination with a door, of an electric motor, and gearing driven by said motor for operating the door, pivoted arms with a stop therefor, a coil-sprin under compression mounted between sai l arms, a telescopic of said arm against said spring, for cuttmg ofi the current from said motor, substant ally by said motor for turning said shaft, arms IIS joint for adjusting the compression of said 1 er connected to said gearjoint for adjustin the compression of said spring, a lug or rol er connected to said gearing, and forcing one or the other of said arms against said s ring when the load on said gearing excee s a predetermined limit, and means controlled by the yielding of said. arm against said spring for cutting off the current from saidmotor, substantially as described.

11. In a system of the character described, the combination with a door or hatch, of an electric motor, and a worm-wheel driven by said motor for operating the door or hatch, pivoted arms with a stop therefor, a-sprin under. compression mounted between sai arms, a lug or rollerconnected to said wormwheel and forcin one or the other of said arms againstsaid spring when the load on said gearing exceeds a predetermined limit in eitherdirection, and means controlled by the yielding of said arm a ainst said spring for cutting off the current om said motor, substantially as described.

12. In a system of the character. described, the combination with a door or hatch, of an electric motor, and a worm-wheel driven-by saidimotor for operating the dooror'hatch, pivoted arms with a stop therefor, a sprin under. compression mounted between sai arms, a lug or roller connected to said WOI'III- wheel and forcin one or the other of said arms against sai spring when the load on said gearing exceeds a predetermined limit, and a-cut-out switch controlled by the yieldin of said arm against said spring for cutting off the current from said motor, substantially as described.

13. In a system of the character described, the combination with a door or hatch, arack or racks secured thereto, and'a shaft With a motor for turnin said shaft, arms pivotally mounted on sai shaft and a stop for said arms, a spring under compression mounted between said arms, a lu or roller connected to said worm-wheel'an'd forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, and a cut-out switch controlled by the yielding of said arm against said spring, for cuttin off the current from said motor, substantia ly as described.

14. In a system of the character described, the combination with a door or'hatch, a rack or racks secured thereto, and a shaft with a pinion or pinions meshing. in said rack or racks, of an'electric motor, and a worm-wheel mounted on said shaft and driven by said motor for turnin said shaft, arms pivotally mounted on sai shaft and a stop for said arms, a spring under compression mounted between said arms, a lug or roller connected to said worm-wheel and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a redetermined limit, and means controlle by the yielding of said arm against said spring, for cutting off the current from said motor, substantially as described.

15.- Ina system of the character described, the combination with a door or hatch, of an electric motor, and a worm-Wheel driven by said motor for operating the door or hatch, pivotedv arms with a stop therefor, a spring under compression mounted between said arms, means for adjusting the compression of said spring," a lug or roller connected to said worm-wheel, and forcing one or the other of said arms againstsaid spring when the load on said gearin exceeds a predetermined limit, in either direction, and means controlled by the yielding of said arm against said spring for. cutting off the current from said motor, substantially as described.

16.- Ina-system of the character described,

the combination-with adoor or hatch, of an electric motor, and a worm-wheel driven by said motor for operating the door or hatch,

.pivoted arms with astop therefor. a spring under compression mounted between said arms, means for adjusting the compression of said spring, a lug or roller connected to said worm-wheel and forcing one or the other of said arms against said spring when the lo ad on said gearing exceeds a predetermined limit, and a cut-out switch controlled by the yielding of said arm a ainst said spring for cutting off the current rom said motor, substantially as described.

17. In a system of the character described, the combination with a door or hatch, a rack or racks secured thereto, and a shaft with a pinion or pinions meshing in said rack or racks, of an electric motor, and a Worm-wheel mounted on said shaft and driven by said 1110- tor for turning said shaft, arms pivotally mounted on said shaft and a stop for said arms, a spring under compression mounted between said arms, a lug or roller connected to said worm-wheel and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, means for adjusting the compression of said spring, and a cut-out switch controlled by the yielding ofsaid arm against said s ring, for cutting off-the current from sai motor, substantially as described.

18. In a system of the character described, the combination with a door, of arr-electric .motor, and gearing driven by said motor for operating the door, pivoted arms with a stop therefor, a coil-spring under com ression mounted between said arms, a te escopic joint for adjusting the compression of said spring, a lug or roller connected to said gearing, and forcing one or the other of said arms against said spring when theload on said gearing exceeds a predetermined limit, and means controlled by the yielding of said arm against said spring for cutting off the current from said motor, substantially as described.

19. In a system of the character described, the combination with a door, of an electric motor, and gearing driven by said motor for operating the door, pivoted arms with a stop t erefor, a coil-spring under compression mounted between said arms, a telescopic joint for adjusting the compression of said spring, a lug or roller connected to said gearmg, and forcing one or the other 'of said arms 'agamst'sai-d spring when the load on said gearing exceeds a redetermined limit, and a cam-sleeve contro led by the yielding of said arm against said spring, and a cut-out switch operated by said camsleeve, for cuttin off t e current from said motor, substantial y as described. 7

i 20. In asystem of the character described, the combination with a door or hatch, of an electric motor, and a worm-wheel driven by said motor for. operating the door or hatch,

pivoted arms with a stop therefor, a spring under compression mounted between said arms, a-lug or roller connected to said wormwheel and forcin one or the other of said arms against sai spring when the load on said gearing exceeds a predetermined limit in either direction, a cam-sleeve, cam-lugs connected to said worm-wheel and engaging said cam-sleeve, and means controlled by the motion of said cam-sleeve due to the yielding of said arm against said spring, for cutting off the current from said motor, substantially as described.

21. In a system of the character described, the combination with a door or hatch, of an electric motor, and aWorm-wheel driven by said motor for'operatingthe door or hatch, pivoted arms with a stop therefor, a sprin under compression mounted between sai arms, a lug or roller connected to said Wormwheel 'and forcing one or the other of said arms against said spring when the load on said gearing exceeds a predetermined limit, a

cam-sleeve, cam-lugs connected to said wormwheel and engaging said cam-sleeve, and a cut-out switch controlled by the motion of said cam-sleeve due to the yielding of said arm against said spring forcutting off the current from said motor, substantially as described 22. In a system of the character described, the combination with a door or hatch, a rack or racks secured thereto, and a shaft with a pinion or pinions meshing in said rack or racks, of an electric motor, and a worm-wheel -mounted on said shaft and driven bysaid motor for turning said shaft, arms pivotally mounted on said shaftand a stop for said arms, a spring under compression'mounted between said arms, a lug-or-roller connected to said worm-wheel and forcing one'or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, a cam-sleeve movable longitudinally on said shaft, cam-lugs con nected to said Worm-wheel and said camsleeve, and a cut-out switch controlled b the motion of said cam-sleeve due to the yie ding of said arm against said spring for cutting off the current from said motor, substantially as described.

23. In a system of the character described, the combination with a door or hatch, a rack or rackssecured thereto, and a shaft with a pinion or pinions meshing in said rack or racks, of an electric motor, and a wormwheel mounted .on said shaft and driven by said motor for turning said shaft, arms pivotally mounted on said shaft and a stop for said arms, a spring under compression mounted between said arms, a lug or roller connected to said worm-wheel and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, a cam-sleeve movable longitudinally on .said shaft, cam-lugs connected to said wormwheel and en aging said cam-sleeve, and means controlled the motion of said cam-sleeve due to the yie ding of said arm against said spring, for cutting ofl the current from said motor, substantially as described.

24. In a system of the character described, the combination with a door or hatch, of an electric motor, and a worm-wheel driven by said motor for o erating the door or hatch, pivoted arms with a stop therefor, a coilspring under compression mounted betweensaid arms, a telescopic joint for supporting said spring and for adjusting the compres sion thereof, a lug or r0 ler connected to said wormwheel, and forcing one or the other of said arms against said spring when theload on said gearing excee s apredetermined limit, in either direction, and means controlled by the yielding of said arm against said spring for cuttin off the current from said motor, substantia ly as described.

25. In a system of the character described, the combination with a door or hatch, of an electric motor, and a worm-wheel driven by said motor for operating the door or hatch, pivoted arms with a stop therefor, telesco ic members pivoted to said arms, respective y, a coil-spring under compression mounted between said arms oversaid telescopic mem-. bers, a screw for adjusting the compression of said s ring, a lug or roller connected to said IIO limit, and a cut-out switch controlled by the yielding of said arm against said spring for cutting off the current from said motor, substantially as described.

26. In a system of the character described,

inclosing said telescopic members, a lug or roller connected to said worm wheel and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, a screw connecting said telesco ic members for adjusting the compression 0 said spring, and a cut-out switch controlled by the yielding of said arm against said spring, for cutting off the current from said motor, substantially as described.

27 In a system of the character described, the combination with a door, of an electric motor; and gearing driven by said motor for operating the door, pivoted arms with a stop therefor, telescopic members connecting said arms, a coil-spring under com .reSsiOn. mountw ed between said arms, and inc osing said telesco(pic members, a lug or roller connected to sai gearing, and forcing c eer the otherof said armsagainst said s ring when the load on said gearing excee s a predetermined limit, and means controlled by the yieldingv of said arm against said spring for cutting-o the current from said motor, substantially as described. I

In a y t f he harac e des ribed, the combination with a (i001; Or hatch, of} an, electric motor, and caring driven by said motor for operating 1; e door or hatch, piirot-- ed arms with a stop therefor, a spring under compression mounted between said, arms, a lug or rollerconnected to said gearing, and

forcing one or the other of said armsyagainst" said s ring when the load on' said gearing, excee s a predetermined; limit, means con;- trolled by the yielding of said arm against,

said spring for cutting off the current from said motor, and means for operating said, gearmg by hand from either side of the lpnllig-v head,when desired, substantiallyas described.

29. In a system of the character described, the combination with a door or hatch, of an electric motor, and caring driven by said motor for operating tide door or hatch, pivoted arms with a stop therefor, a spring under compression mounted between, said arms,

means for adjusting the compression of; said spring, a lug or roller connected tosaid gearing, and forcing oneor the other of said arms against said spring when the load on aid, gearing exceeds a predetermined limit, a cutout switchcontro led by the yielding of said: arm against said spring for cutting off the current from said motor, and: means,for=opcrating said gearing by hand from either side of the bulkhead, when desired, substantially as described.

30. In a system of the character described, the combination with a door or hatch, a rack or racks secured thereto, and a shaft with pinions meshing in said racks, of an electric motor, and gearing driven by said motor for turning said shaft, arms pivotally mounted on said shaft and a stop therefor, a spring under compression mounted between said arms, a lug or roller connected to a member of said gearing and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, a cut-out switch controlled by the yielding of said arm against said spring, for cutting off the current from said motor, and means for operatin said gearing by hand, from either side of t e bulkhead, when desired, substantially as described.

31. In a system of the character described,

the combination with a door or hatch, a rack or racks secured thereto, and a shaft with pinions meshing in said racks, of an electric.

sijde of; the bulk ead, when desired, substani'tially as described. y 32-. In a system of the character described, the combination with a door, of an electric motor, and gearing driven by said motor for o crating the door, pivoted arms with a stop '0 erefor, .a coil -s prin under com ression mounted. between sai arms, a te escopic spring, a lug or ro er; connected to said gearing, and,forcingoneor the other of said arms against said spring when the load on saidgearing exceeds a predetermined limit, .a cam-sleeve controlled by the yielding of said arm against -said spring, a pivoted arm 1 the current from said motor, substantial y as described.

33. In a system of thecharacter described, the combination with a door or hatch, of anelectric motor, and a worm-wheel driven, by said; motor for operating thedoor or'hatch, pivoted arms with a stop therefor, a sprin r under compression mounted between sai arms, al or roller connected-to said worm wheel and forcing one or the other of saidarms a n ai srn wh t lo n. said operating said caring by hand from either I I Io' joint for adjusting the compression of said 7 rocked by said cam-sleeve and a cut-out switch operated by said arm, for cutti ofl' the current from said motor, substantia described.

gearing exceeds a predetermined limit in I either direction, a cam-sleeve, cam-lugs connected to said worm-wheel and engaging said cam-sleeve, a pivoted arm rocked by said cam-sleeve and a cut-out switch operated by said arm, for cutting off the current from said motor, substantially as described.

34. In a system of the character described, the combination with a door or batch, of an electric motor, and a worm-wheel driven by said motor for operating the door or hatch, pivoted arms with a stop therefor, a spring under compression mounted between said arms, a lug or roller connected to said worm' wheel and forcing one or the other of said arms against said spring when the load on said gearing exceeds a predetermined limit, a cam-sleeve, cam-lugs connected to said Wormwheel and enga ing said cam-sleeve, a pivoted arm rocked by said cam-sleeve and a cut-out switch operated by said arm, for cutting off the current from said motor, substantially as described.

35. In a system of the character described, the combination with a door or hatch, a rack or racks secured thereto, and a shaft with a pinion or pinions meshing in said rack or racks, of an electric motor, and a wormwheel mounted on said shaft and driven by said motor for turning said shaft, arms pivotally mounted on said shaft and a stop for said arms, a spring under compression mounted between said arms, a lug or roller connected to said Worm-Wheel and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, a cam-sleeve movable longitudinally on said. shaft, cam-lugs connected to said wormwheel and said cam-sleeve, a pivoted arm rocked by said cam-sleeve and a cut-out switch operatedby said arm, for cutting off 1 y as 36. In a system of the character described, the combination with. a door or hatch, a rack or racks secured thereto, and a shaft with a pinion or pinions meshing in said rack or racks, of an electric motor, and a worm-wheel mounted on said shaft and driven by said motor for turning said shaft, arms pivotally mounted on said shaft and a stop for said arms, a spring under compression mounted between said arms, a lug or roller connected to said worm-wheel and forcing one or the other of said arms against the action of said spring when the load on said gearing exceeds a predetermined limit, a cam-sleeve movable 0ngitudinally on said shaft, cam-lugs connected to said worm-wheel and engaging said cam-' sleeve, a pivoted arm rocked by said camsleeve and a cut-out switch operated by said arm, for cutting off the current from said motor, substantiady as described.

37. In a system of the character described, the combination with a door or hatch, of an electric motor, and a worm-Wheel driven by said motor for operating the door or hatch, pivoted arms with a stop therefor, a coilspring under compression mounted between said arms, a telescopic joint for supporting said spring and for adjusting the compression thereof, a lug or roller connected to said worm-Wheel, and forcing one or the other of said arms against said spring when the load on said gearing exceeds a predetermined limit, in either direction, a pivoted arm rocked by said cam-sleeve and a cut-out switch operated by said arm, for cuttin off the current from said motor, substantial y as described.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM BARNUM COWLES.

Witnesses W. J. Sums, H. WATSON. 

